Orbital impacts

Glowing blood and possible alien infections. Human sensitivity to positive and negative g-forces. Trying to push more blood to your head for mental superpowers.

Orbital transfer

And impromptu deorbiting. How to crash a probe into mars (by accident).

Pressurization

Chinese space stations, then and now. Station entrance and exit procedures. Finally the Star Trek balloon analogy comes in handy! Decompression sickness/the bends during EVA. Portable life support systems. Sokol and ACES, and their insufficiency for extra-vehicular activities.

EVA Suits

Past designs and modern designs. Future EVA suit developments. Constrictive suits directly against the skin rather than creating an atmosphere around the body: the biosuit. The NASA Z Suit that looks like Buzz Lightyear, and operating EVA suits at the same pressure as your space station.

Reentry

Soyuz reentry angles. Heat shielding. Trying to point in a particular direction.

Lifting

The complete obviousness that heavy compound weight lifting is the major solution to muscle and bone loss in space. Bro do you even lift? Vacuum-based space squat rack.